Abstract |
Oxidative stress has been suggested to be an important molecular mechanism of toxic effects of lead in the kidney. Thioredoxin reductase-1 is a selenoprotein involved in many cellular redox processes. This study evaluated the effect of acute and chronic exposure intraperitoneally to lead acetate on thioredoxin reductase-1 activity and on other oxidative stress parameters in the rat kidney, as well as on indicators of renal function commonly used to assess lead poisoning. Acute exposure to 25 mg/kg lead acetate increased superoxide dismutase and thioredoxin reductase-1 activity (after 6, 24 and 48 hr), while exposure to 50 mg/kg lead acetate increased catalase activity (after 48 hr) and inhibited delta-aminolevulinate dehydratase activity (after 6, 24 and 48 hr) in the kidney (P < 0.05). Chronic exposure (30 days) to 5 mg/kg lead acetate inhibited delta-aminolevulinate dehydratase and increased glutathione S-transferase, non- protein thiol groups, catalase, thioredoxin reductase-1 and uric acid plasma levels, while exposure to 25 mg/kg lead acetate reduced body weight and delta-aminolevulinate dehydratase, but increased glutathione S-transferase, non- protein thiol groups and uric acid plasma levels (P < 0.05). No changes were observed in thiobarbituric acid reactive substances, glutathione peroxidase, creatinine or inorganic phosphate levels after either acute or chronic exposure. Our results suggest that thioredoxin reductase-1 may be an early indicator of acute exposure to low lead doses.
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Authors | Greicy M M Conterato, Paula R Augusti, Sabrina Somacal, Lídia Einsfeld, Rocheli Sobieski, Juliana R V Torres, Tatiana Emanuelli |
Journal | Basic & clinical pharmacology & toxicology
(Basic Clin Pharmacol Toxicol)
Vol. 101
Issue 2
Pg. 96-100
(Aug 2007)
ISSN: 1742-7835 [Print] England |
PMID | 17651309
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Organometallic Compounds
- Uric Acid
- Creatinine
- Thioredoxin Reductase 1
- Thioredoxin-Disulfide Reductase
- Txnrd1 protein, rat
- Porphobilinogen Synthase
- lead acetate
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Topics |
- Animals
- Creatinine
(blood)
- Dose-Response Relationship, Drug
- Kidney
(drug effects, enzymology)
- Kidney Function Tests
- Male
- Organometallic Compounds
(pharmacology)
- Oxidative Stress
(drug effects)
- Porphobilinogen Synthase
(drug effects, metabolism)
- Rats
- Rats, Wistar
- Thioredoxin Reductase 1
- Thioredoxin-Disulfide Reductase
(drug effects, metabolism)
- Uric Acid
(blood)
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